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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
Glaucoma: Overview01:25

Glaucoma: Overview

Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.

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Related Experiment Video

Updated: May 24, 2026

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
05:46

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Published on: September 20, 2024

Gain in visual acuity after cataract surgery improves postural stability and mobility.

B Durmus1, S Emre, C Cankaya

  • 1Department of Physical Medicine and Rehabilitation, Inonu University School of Medicine, Malatya, Turkey. durmusbekir@yahoo.com

Bratislavske Lekarske Listy
|March 1, 2012
PubMed
Summary

Improving visual acuity through cataract surgery significantly enhances postural stability and mobility. This study shows better balance and movement in patients after the procedure.

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Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
07:06

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

Area of Science:

  • Ophthalmology and Vision Science
  • Gerontology
  • Biomechanics and Motor Control

Background:

  • Vision is crucial for maintaining postural stability and balance.
  • Visual information and environmental cues significantly impact balance skills.
  • Age-related cataracts impair visual acuity, potentially affecting stability and mobility.

Purpose of the Study:

  • To investigate the impact of improved visual acuity on postural stability and mobility.
  • To assess changes in balance and gait parameters before and after cataract surgery.

Main Methods:

  • A cohort of 57-84 year old patients (n=36) with age-related cataracts underwent assessment before and four weeks after surgery.
  • Evaluations included the Biodex Stability System (BSS), Tinetti, Time Up and Go (TUG), and Functional Reach (FR) tests.
  • Gait analysis measured gait velocity, step length, step width, cadence, and stride length.

Main Results:

  • Postoperative visual acuity significantly improved.
  • Significant improvements were observed in gait velocity and cadence.
  • Post-surgery, patients showed significant gains in balance (Tinetti, TUG, FR) and stability indices (APSI, MLSI, OSI) measured by BSS.

Conclusions:

  • Enhanced visual acuity following cataract surgery leads to improved postural stability and mobility.
  • Cataract surgery positively impacts various measures of balance and gait.
  • Restoring visual acuity is an effective intervention for enhancing functional mobility in elderly patients.